| Column-$I$ | Column-$II$ |
| $(P)$ $(X+O)$ | $(i)$ Genetic constitution in Drosophila |
| $(Q)$ $(XX+XY)$ | $(ii)$ Genetic constitution in grasshopper |
| $(R)$ $(ZZ+ZW)$ | $(iii)$ Sex determination in birds |
| $(S)$ $(AA+XX)$ | $(iv)$ Sex determination in humans |
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